Get a Tight Butt and Legs

Step-Ups with Knee Raise

Works abs, hip flexors, glutes, hamstrings, and quads
Place a 12- to 24-inch-high step in front of you. Step up with your left foot [A], bringing your right leg forward and up and bending your knee until your thigh is parallel to the floor [B]. Lower your right leg back to start, then the left. Repeat with the other leg. That's 1 rep; do 10.